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Prof Botma Visser takes on rust diseases threatening South Africa’s wheat

09 September 2025 | Story Martinette Brits | Photo Stephen Collett

Safeguarding one of the world’s most vital staple foods was at the heart of the inaugural lecture delivered by Prof Botma Visser, Professor in the Department of Plant Sciences at the University of the Free State (UFS), on Wednesday 3 September 2025. Prof Visser shared insights from nearly two decades of research into wheat rust – a devastating crop disease that threatens both South Africa’s harvests and global food security.

“Wheat production in South Africa is threatened by three fungal pathogens that cause rust disease on the crop. Understanding the factors that contribute to virulence on locally grown cultivars is crucial to ensure continued wheat production,” said Prof Visser.

The fight against evolving wheat rusts

For the past 17 years, Prof Visser’s research has focused on the genetic structure of rust populations and the risks they pose to food security. His work has shown that these populations are dynamic and constantly changing due to genetic mutations within existing races, as well as the introduction of new races into South Africa.

“Computer modelling showed that rust can spread over vast distances by prevailing winds. During the 20th Century, at least four Southern African stem rust races managed to move across the Indian Ocean from Southern Africa to Australia. South Africa, in turn, received multiple new races from mid-Africa across Zambia and Zimbabwe, without any means of stopping these introductions,” he explained.

To respond to this challenge, his team recently implemented MARPLE (Mobile And Real-time Plant disEase) diagnostics using fourth-generation nanopore sequencing technology. This approach allows the rapid characterisation of fungal isolates, specifically targeting genes linked to fungicide resistance and virulence.

“This work,” Prof Visser noted, “is part of an effort to safeguard global wheat production.”

His research is a collaborative effort with Prof Willem Boshoff (Department of Plant Sciences, UFS) and Dr Tarekegn Terefe (Agricultural Research Council – Small Grain, Bethlehem). Together, their work has positioned the UFS as an internationally recognised centre of excellence in wheat rust research.

About Prof Botma Visser

Prof Botma Visser obtained his BSc in Botany and Microbiology (1988), BSc Honours in Microbiology (1989), and MSc in Botany (1993) at the University of the Free State, where he also completed his PhD in Botany in 2004.

His career spans more than 18 years of research into wheat rust pathogens, combining annual surveys, race pathotyping, molecular genetics, and cutting-edge sequencing technologies. His expertise has not only advanced understanding of rust population dynamics in South Africa but also contributed to global collaborative studies on crop disease.

News Archive

Teacher training key to democracy and freedom

2011-12-06

MEC Mr Tate Makgoe (left) with Faculty of Education’s Prof. Dennis Francis, holding the inaugural SURLEC Award. With them is Dr Dipane Hlalele.
Photo: Thabo Kessah

Universities have the responsibility to respond to the challenges that the South African education system is faced with.

This is the view of the Free State MEC for Education, Mr Tate Makgoe, during his address at the three-day First Sustainable Rural Learning Ecologies (SURLEC) Colloquium, which was recently held at the Qwaqwa Campus of the University of the Free State (UFS).

“Our universities must not only research the failures of our system. They must also come up with solutions.

“One of the questions that demand answers in our country is whether we produce quality teachers at our universities, considering our learners’ performance internationally. Our children lack the basics like grammar and yet we are 17 years into democracy. Why is their performance so poor in comparison to children in poorer countries?” asked Mr Makgoe.

“We must work together as a Government and universities to change this. Universities must be anchors of democracy and freedom, which is meaningless if our children cannot read and write. We must also focus on Mathematics and Natural Sciences, not forgetting to value our indigenous knowledge and games to enhance learning, especially in Mathematics,” he said.

According to Dr Dipane Hlalele, Head of the Faculty of Education at the UFS Qwaqwa Campus, the colloquium was held to search for best practices and success stories relating to the theme, Creating sustainable rural learning ecologies in the 21^st century.

“Our objective was to tap into experiences and wisdom of policy makers, researchers, scholars, teachers and students in order to map a new direction in research as well as to make an indelible mark on the revitalisation of this campus,” concluded Dr Hlalele.

The UFS Dean of Education, Prof. Dennis Francis’ efforts to improve rural education were honoured with the first ever SURLEC Award.

Over 70 research papers from the universities of the Free State, South Africa, Venda, KwaZulu-Natal, Limpopo and the Cape Peninsula University of Technology were delivered and learners from the local schools like The Beacon, Mafube, Qwaqwa and Clubview presented their winning projects at the Science Expo.

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